asp.net+ajaxfileupload.js 实现文件异步上传代码分享

前端技术 2023/09/06 .NET

由于代码很简单，这里就闲话不多说了，直接上代码，小伙伴们自己研读代码就明白了。

前台代码： 

复制代码 代码如下:

/*修改头像*/ 
    //上传 
    function _sc() { 
        $(\".ckfile\").html(\"\").css(\"color\", \"#535353\"); 
        $(\"#_userImgPath\").val(\"\"); 
        var str = $(\"#file\").val(); 
        if ($.trim(str) == \"\") { 
            $(\".ckfile\").html(\"请选择文件。\").css(\"color\", \"red\"); 
            return false; 
        } 
        else { 
            var postfix = str.substring(str.lastIndexOf(\".\") + 1).toUpperCase(); 
            if (postfix == \"JPG\" || postfix == \"JPEG\" || postfix == \"PNG\" || postfix == \"GIF\" || postfix == \"BMP\") { 
                $(\'#showimg\').attr(\'src\', \'Images/loading.gif\').attr(\"title\", \"上传中，请稍后…\"); 
                var path = \"Upload/UserImg\"; 
                $.ajaxFileUpload({ 
                    url: \'/Upload.aspx?path=Upload|UserImg&shape=100*100\', 
                    secureuri: false, 
                    fileElementId: \'file\', 
                    dataType: \'text\', 
                    success: function (msg) { 
                        if (msg.lastIndexOf(path) == -1) { 
                            $(\".ckfile\").html(msg).css(\"color\", \"red\"); 
                        } 
                        else { 
                            $(\'#showimg\').attr(\'src\', msg).attr(\"title\", \"我的头像\"); 
                            $(\"#_userImgPath\").val(msg); 
                        } 
                    } 
                }); 
            } else { 
                $(\".ckfile\").html(\"文件格式错误。\").css(\"color\", \"red\"); 
                return false; 
            } 
        } 
    } 

后台代码：

复制代码 代码如下:

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using SS.Upload; 
using WFC.Fenxiao; 
namespace wanfangcheng 
{ 
    public partial class Upload : BasePage 
    { 
        //文件大小 1024 kb 
        private long size = 1024; 
        //文件类型 
        private string type = \".jpg|.jpeg|.png|.gif|.bmp\"; 
        //保存名称 
        string name = \"\"; 
        //保存路径 
        private string path = @\"Upload/UserImg\"; 
        //保存大小 
        private string shape = \"100*100\"; 
        protected void Page_Load(object sender, EventArgs e) 
        { 
            HttpFileCollection files = Request.Files; 
            if (files != null && files.Count > 0) 
            { 
                name = BaseRole.Instance.UserId.ToString(); 
                if (Request.QueryString[\"size\"] != null) 
                { 
                    size = Convert.ToInt32(Request.QueryString[\"size\"]); 
                } 
                if (Request.QueryString[\"path\"] != null) 
                { 
                    path = Request.QueryString[\"path\"].ToString().Trim().Replace(\'|\', \'/\'); 
                } 
                if (Request.QueryString[\"name\"] != null) 
                { 
                    name = Request.QueryString[\"name\"].ToString().Trim(); 
                } 
                if (Request.QueryString[\"shape\"] != null) 
                { 
                    shape = Request.QueryString[\"shape\"].ToString().Trim(); 
                } 
                uploadMethod(files); 
            } 
        } 
        /// <summary> 
        /// 上传图片 
        /// </summary> 
        /// <param name=\"hc\"></param> 
        public void uploadMethod(HttpFileCollection hc) 
        { 
            HttpPostedFile _file = hc[0]; 
            //文件大小 
            long _size = _file.ContentLength; 
            if (_size <= 0) 
            { 
                Response.Write(\"文件错误。\"); 
                Response.End(); 
                return; 
            } 
            if (size * 1024 < _size) 
            { 
                Response.Write(\"文件过大,最大限制为\" + size + \"KB。\"); 
                Response.End(); 
                return; 
            } 
            //文件名 
            string _name = _file.FileName; 
            //文件格式 
            string _tp = System.IO.Path.GetExtension(_name).ToLower(); 
            if (type.IndexOf(_tp) == -1) 
            { 
                Response.Write(\"文件格式错误。\"); 
                Response.End(); 
                return; 
            } 
            //保存路径 
            string _path = HttpContext.Current.Server.MapPath(path) + @\"/\" + name + _tp; 
            try 
            { 
                int w = Convert.ToInt32(shape.Split(\'*\')[0]); 
                int h = Convert.ToInt32(shape.Split(\'*\')[1]); 
                ImageHelper.CutForCustom(_file, _path, w, h, 50); 
                Response.Write(path + @\"/\" + name + _tp); 
            } 
            catch (Exception) 
            { 
                Response.Write(\"哎呦，出错了。\"); 
                Response.End(); 
            } 
        } 
    } 
} 

是不是很实用，也很简单易懂呢，以上是自己项目中使用的代码，小伙伴们如果发现有问题的地方，还请告之。谢谢

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